I don't understand what you mean by "changing dimension" but I do see one problem with your code. $. is the line count on a given filehandle, reset each when you close the handle. Except you never close $fh, so your line count is not 1 for the first line of the second file (but 1 + the number of lines in the first file).

You should probably use distinct names for the two handles (eg: $dict_fh and $csv_fh).

Another way (not excluding the previous one) to correct your code is to properly close the handles when done using them. This can be done implicitly by limiting the life of the handle to a block, so that it is closed automatically on destruction. Using do, this can be done like this: 

my %dict = do { 
  open my $dict_fh, "<", $path or die "Couldn't open $path: $!";
  map { chomp; split ' ', $_, 2 } <$dict_fh>;
};
# $dict_fh doesn't exist here, so it is closed

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In reply to Re: Parsing csv without changing dimension of original file by Eily
in thread Parsing csv without changing dimension of original file by zillur

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